Some helpful videos about using U.S. church records
Church records are an excellent genealogical resource, particularly in earlier times when births, marriages, and deaths were not yet recorded by the government.
The following video from FamilySearch gives an overview of U.S. church records research. It explains why we should use church records, how to find them, types of church records and information found in them, and ways to determine an ancestor's religion. (Note that you will want to click on the box at the bottom right of the video to view it full screen.)
There are some basic differences between civil registration and church records. The following video from the Barefoot Genealogist at Ancestry.com explains these and also what you might expect to find in both that will assist in your genealogy research.